ePassport RFID Challenges

The RFID technology in e-passports and enhanced drivers licenses present a security challenge. Privacy and border security can be at risk from unauthorized reading of the RFID tags. ...

... "The tags are inexpensive and can, in ideal conditions, be read from about 150 feet away -- an unusually long range for RFID, says Ari Juels, director and chief scientist at RSA Laboratories ... " ...

Via MIT Tech Review: Security Problem